Artificial intelligence (AI) and algorithmic decision-making play a large and increasing role in how we conduct economic activity and organize our societies. We use such algorithms to allocate public funds, discover and share information, hire employees, approve mortgages, and a variety of other important tasks. However, despite the fact that these algorithms and the people that use them usually don't act in isolation, most work in AI does little to examine the precise mechanics of how people and algorithms interact, adapt and mutually influence each other through economic, physical,...